US9399591B2 - Nitrogen-containing compounds for bacterial control in water based fluids - Google Patents
Nitrogen-containing compounds for bacterial control in water based fluids Download PDFInfo
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- US9399591B2 US9399591B2 US14/268,554 US201414268554A US9399591B2 US 9399591 B2 US9399591 B2 US 9399591B2 US 201414268554 A US201414268554 A US 201414268554A US 9399591 B2 US9399591 B2 US 9399591B2
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/004—Apparatus and plants for the biological treatment of water, waste water or sewage comprising a selector reactor for promoting floc-forming or other bacteria
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
Definitions
- the present invention relates to methods and water treatment systems for at least partially reducing an amount of a first bacteria within a wastewater stream by adding an effective amount of at least one nitrogen-containing composition to the wastewater stream.
- Biological and chemical compounds in certain wastewater streams may need to be reduced to a particular amount or removed altogether.
- Various attempts have been made to address treatment of such compounds. Therefore, it would be beneficial to discover new methods to treat wastewater and further reduce the amount of undesirable bacteria within the wastewater stream.
- a method for adding an effective amount of at least one nitrogen-containing compound to a wastewater stream within a water treatment system may have or include an aqueous-based fluid, a first bacteria, a second bacteria, and at least one organic acid.
- the first bacteria may be or include filamentous bacteria, Zoogloea bacteria, and combinations thereof.
- the method may include at least partially reducing an amount of the organic acid(s), and at least partially reducing an amount of the first bacteria within the wastewater stream as compared to an otherwise identical wastewater stream absent the nitrogen-containing compound(s).
- nitrogen-containing composition(s) may be added to at least one anoxic zone within the water treatment system having to obtain a nitrogen to carbon ratio of about 0.01 to 100.
- the method may include at least partially reducing an amount of the organic acid(s), and at least partially reducing an amount of the first bacteria within the anoxic zone as compared to an otherwise identical anoxic zone absent the nitrogen-containing composition(s).
- the anoxic zone(s) may be a return activated sludge (RAS) line downstream from an aeration basin, a secondary clarifier downstream from an aeration basin, a tank upstream from an aeration basin, an anoxic zone within the aeration basin, and combinations thereof.
- RAS return activated sludge
- a water treatment system having a wastewater stream flowing therethrough, such as an influent wastewater stream flowing into the wastewater treatment system, at least one anoxic zone, an aeration basin, and an effluent wastewater stream flowing out of the water treatment system.
- the influent wastewater stream may flow into the water treatment system having at least a first bacteria and at least one organic acid.
- the first bacteria may be or include filamentous bacteria, Zoogloea bacteria, and combinations thereof.
- the anoxic zone may have or include the wastewater stream, an effective amount of at least one nitrogen-containing compound, and a second bacteria.
- the second bacteria may be or include facultative bacteria, spore-forming bacteria, phenol-degrading bacteria, denitrifying bacteria, organic acid-degrading bacteria, high temperature bacteria, and combinations thereof.
- the effluent wastewater stream may have or include a reduced amount of the first bacteria as compared to an otherwise identical effluent wastewater stream absent at least one nitrogen-containing compound.
- the water treatment system may have a first anoxic zone located upstream from an aeration basin, and a second anoxic zone located downstream from the aeration basin.
- the wastewater stream may flow from the first anoxic zone to the aeration basin to the second anoxic zone and then back to the first anoxic zone as a loop until the amount of the first bacteria is reduced to a predetermined level.
- the second bacteria may consume the organic acid(s) in the presence of the nitrogen-containing compounds, which decreases the amount of organic acids available for consumption by the first bacteria, and thereby reduces the amount of the first bacteria.
- FIG. 1 is a diagram of one embodiment of the water treatment system having a first anoxic zone
- FIG. 2 is another non-limiting embodiment of the water treatment system where the first anoxic zone is downstream from an aeration basin;
- FIG. 3 is another non-limiting embodiment of the water treatment system having at least two anoxic zones.
- the aqueous-based wastewater fluid may be or include desalter wash water, overhead water from atmospheric or vacuum process units, strip sour water, coker blowdown, cooling water blowdown, boiler blowdown, oily water sewers, equalization tanks, cleaning solutions used for scale removal, water bottoms from storage tanks, API units, dissolved gas flotation units, and combinations thereof.
- ‘Out-compete’ is defined herein as the ability of the second bacteria to consume the organic acids at a faster rate than the first bacteria. The result may be a decline or elimination of the first bacteria population.
- the wastewater stream may have or include, but is not limited to, an aqueous-based fluid, a first bacteria, a second bacteria, at least one organic acid, and combinations thereof.
- Organic acids may be present in a wastewater stream because the organic acids are added to crude oil to improve the removal of contaminants from the crude oil when processing the crude oil at a refinery, such as during a desalting process of the crude oil.
- the origin of organic acids may also include their presence in certain type of crudes. These crudes include, but are not limited to, heavy Canadian crudes, Venezuelan crudes, and shale oils.
- Organic acids may also be generated by anaerobic activity found in sewer systems and holding tanks within an industrial setting. However, organic acids present in the wastewater stream may increase the growth of bacteria that utilize the organic acids. The overgrowth of the bacteria may result in poor settling conditions in the water treatment system.
- the first bacteria may be or include, but is not limited to, filamentous bacteria, Zoogloea bacteria, and combinations thereof.
- filamentous bacteria may be or include, but are not limited to Nostocoida limicola, Thiothrix , type 021N, type 0581, type 0411, other organisms, and combinations thereof.
- the type 021N, type 0581, type 0411 bacteria are filamentous bacteria that have been observed in wastewater systems but may not be grown outside of the wastewater treatment system. Such designations were devised by Dick Eikelboom, known by those skilled in the art of waste-water treatment systems.
- ‘Other organisms’ is defined herein to be any organism that has a selective advantage to proliferate when organic acids are present in a waste treatment system; such ‘other organisms’ may cause issues in the waste treatment system if they happen to over-proliferate.
- Non-limiting examples of the Zoogloea bacteria may be or include, but are not limited to amorphous Zoogloea , fingered Zoogloea , and combinations thereof.
- First bacteria are defined herein as the bacteria that are targeted to be out-competed by the second bacteria;
- ‘second bacteria’ are defined herein as the bacteria that may out-compete the first bacteria for similar nutrients.
- the second bacteria may out-compete the first bacteria in consuming the organic acid(s).
- the second bacteria may convert nitrate (—NO 3 ), nitrite (—NO 2 ), and/or a denitrification intermediate, and combinations thereof and consume the organic acids in the process in one non-limiting embodiment.
- a denitrification intermediate is defined herein as any intermediate associated with the denitrification process.
- the addition of nitrogen-containing composition(s) to the wastewater stream may allow for continuous de-nitrification to occur under anoxic conditions for consumption of the organic acids by the second bacteria. Ultimately, decreasing the amount of the organic acids available for the growth of the first bacteria may reduce the amount of the first bacteria.
- the second bacteria may be or include, but is not limited to, facultative bacteria, spore-forming bacteria, phenol degrading bacteria, denitrifying bacteria, organic acid-degrading bacteria, high temperature bacteria, and combinations thereof.
- a non-limiting example of the second bacteria may be the bacterial additive known as CHEMCROBE 751TM, which is distributed by Baker Hughes Incorporated.
- Facultative bacteria may aerobically metabolize dissolved oxygen if present in the wastewater stream. However, the facultative bacteria may switch to an anaerobic metabolism or an anoxic metabolism in the absence of dissolved oxygen.
- Non-limiting examples of the facultative bacteria for out-competing the first bacteria may be or include, but is not limited to Thiobacillus denitrificans, Micrococcus denitrificans, Paracoccus Alcagenes, Flavobacterium and Pseudomonas , other facultative bacteria capable of consuming organic acids under anaerobic or anoxic conditions that may or may not also denitrify, and combinations thereof.
- Spore-forming bacteria may form a spore, which is a stripped-down, dormant form of the bacteria that the bacteria may reduce itself into. Spore formation is usually triggered by a lack of nutrients available to the bacteria, and the spore enables the bacteria to lie dormant for extended periods of time. When the environment becomes more favorable, the spore may reactivate itself into its vegetative state. Most types of bacteria cannot change to the endospore form.
- Non-limiting examples of spore-forming bacteria may be or include Bacillus, Clostridium , and combinations thereof.
- the phenol-degrading bacteria typically degrade phenols but may degrade nitrogen in the absence of phenol.
- Non-limiting examples of the phenol-degrading bacteria may be or include, but is not limited to Azoarcus, Thauera, Streptococcus epidermis, Rhodococcus rhodochrous, Pseudomonas putida , other phenol-degrading bacteria, and combinations thereof.
- the denitrifying bacteria may metabolize nitrogenous compounds, such as those bacteria having a nitrate reductase enzyme in a non-limiting instance, where oxides may be turned back into nitrogen gas and/or nitrous oxides.
- Non-limiting examples of denitrifying bacteria may be or include, but is not limited to, Paracoccus denitrificans, Pseudomonas stutzeri , and combinations thereof.
- the organic acid-degrading bacteria may degrade or otherwise inactivate an organic acid, such as glycolic acid, malic acid, acetic acid, lactic acid, butyric acid, propionic acid, and combinations thereof in a non-limiting example.
- the organic acid-degrading bacteria may use glycolic acid for energy and/or to produce carbon dioxide in a non-limiting embodiment.
- the organic acid-degrading bacteria may use acetic acid for growth, and the acetic acid may aid in formation of the bacteria cells in another non-limiting embodiment.
- the organic acid-degrading bacteria may be or include, but is not limited to Paracoccus denitrificans, Pseudomonas stutzeri , and combinations thereof.
- the high temperature bacteria may exist at high temperatures ranging from about 25 C independently to about 46 C, or from about 35 C independently to about 43 C.
- Non-limiting examples of the high temperature bacteria may be or include bacteria that may grow at such high temperatures, which may be or include any of the bacteria mentioned herein.
- the second bacteria may be added to the wastewater stream at a rate ranging from about 20 to about 100 pounds (lbs)/day per million gallons of wastewater stream for the first 3 days of operation.
- the amount of the second bacteria may be added to the wastewater stream in a reduced amount, such as from about 5 to about 40 lbs/day per million gallons of bioreactor flow.
- the nitrogen-containing composition(s) may be or include, but are not limited to, nitrates, nitrites, denitrification intermediates, and combinations thereof.
- the nitrogen-containing composition(s) may be added to the water treatment system at a rate, such as, continuously, intermittently at consistent intervals, intermittently at inconsistent intervals, and combinations thereof.
- the effective amount of the nitrogen-containing composition(s) may have a nitrogen to carbon ratio of about 0.01 to 100, alternatively from about 0.05 independently to about 20, or from about 0.5 independently to about 1.
- the nitrogen-containing composition(s) may be added to the wastewater stream when the wastewater stream has a temperature ranging from about 60° F. independently to about 110° F., or from about 85° F. independently to about 90° F. independently to about 99° F. in another non-limiting embodiment.
- a temperature ranging from about 60° F. independently to about 110° F., or from about 85° F. independently to about 90° F. independently to about 99° F. in another non-limiting embodiment.
- “independently” means that any lower threshold may be used together with any upper threshold to give a suitable alternative range.
- the effective amount of the nitrogen-containing composition(s) may be added into at least one anoxic zone, such as a first anoxic zone only, a second anoxic zone only, and combinations thereof.
- the effective amount of the nitrogen-containing compound(s) may be divided between the anoxic zones depending on the desired outcomes.
- ‘Anoxic zone’ is defined herein to be any zone within the water treatment system where de-nitrification may occur and meet the metabolic needs of the second bacteria.
- the dose rate should be used as a guide only.
- Factors that affect dose rates may include, but are not limited to, the concentration of organic acids in the influent stream, the amount of de-nitrifying bacteria present to consume the organic acids, pH, temperature, toxicity of influent wastewater, wastewater treatment goals, substrates (e.g. bacteria) to be treated, and desired effluent wastewater quality.
- Biological wastewater treatment plants may require substantially more bacteria than put forth here and many may use much less.
- an additional additive may be added to the wastewater stream at the same time or different time as the nitrogen-containing composition(s).
- the additional additive may be or include, but is not limited to, denitrifying bacteria, phenol degrading bacteria, microorganisms, macroorganisms, micronutrients, macronutrients, trace elements, vitamins, and combinations thereof.
- Macronutrients may be or include, but are not limited to phosphorus (e.g. ortho PO 4 ), ammonia, other phosphorus containing compounds, amines or ammonia containing compounds, and the like.
- the amount of macronutrients within the wastewater may range from about 0.5 ppm independently to about 5 ppm, or from about 1 ppm independently to about 3 ppm.
- the organic acids may be or include, but are not limited to, glycolic acid, malic acid, acetic acid, lactic acid, butyric acid, propionic acid, succinic acid, fumaric acid, benzoic acid, other water-soluble organic acids, alcohols, and combinations thereof.
- the second bacteria may consume the organic acids at a faster rate than the first bacteria. In addition to or in the alternative, the second bacteria may consume more of the organic acids in the presence of the nitrogen-containing composition(s) as compared to the amount of organic acids consumed by the second bacteria absent the nitrogen-containing composition(s).
- the first anoxic zone within the water treatment system may be or include, but is not limited to a return activated sludge (RAS) line, a secondary clarifier, a tank upstream from an aeration basin, an anoxic zone within the aeration basin, and combinations thereof.
- the water treatment system may have or include an optional second anoxic zone that is different from the first anoxic zone, but may be a return activated sludge (RAS) line, a secondary clarifier, a tank upstream from an aeration basin, an anoxic zone within the aeration basin, and combinations thereof.
- RAS return activated sludge
- FIG. 1 is a diagram of one embodiment of the water treatment system 10 .
- the influent wastewater 12 flows into the water treatment system and into a first anoxic zone 14 upstream from the aeration basin 16 .
- the nitrogen-containing compounds may be added to the first anoxic zone 14 .
- the second bacteria may out-compete the first bacteria for available organic acids and thereby reduce the selective advantage of the first bacteria. This may lead to lower levels of the second bacteria and better wastewater system performance. Over time, the first bacteria may be starved out and may be replaced by second bacteria.
- the wastewater may flow from the first anoxic zone 14 to the aeration basin 16 and eventually out of the water treatment system as effluent wastewater 18 .
- the effluent wastewater 18 may have a reduced amount of the first bacteria as compared to an otherwise identical effluent wastewater 18 absent the nitrogen-containing composition(s).
- the wastewater may be flowed back to the anoxic zone 14 from the aeration basin 16 via a return activated sludge line (RAS) line 20 depending on the levels of the first and/or second bacteria present in the wastewater.
- RAS return activated sludge line
- the nitrogen-containing composition may be added to the RAS line 20 in addition to or alternative to the first anoxic zone 14 .
- FIG. 2 is another non-limiting embodiment of the water treatment system 10 where the first anoxic zone 14 may be downstream from the aeration basin 16 depending on the configuration of the water treatment system 10 .
- FIG. 3 is another non-limiting embodiment of the water treatment system 10 having a second anoxic zone 22 in addition to the first anoxic zone 14 .
- the second anoxic zone 22 may have an effective amount of the nitrogen-containing composition(s) added thereinto.
- the wastewater stream may flow from the first anoxic zone 14 to the aeration basin 16 to the second anoxic zone 22 and eventually out of the water treatment system 10 as effluent wastewater 18 .
- the wastewater stream may be flowed from the second anoxic zone 22 back to the first anoxic zone 14 via a return activated sludge line (RAS) line 20 as a loop until the amount of the first bacteria is reduced to a desirable level.
- RAS return activated sludge line
- the nitrogen-containing composition(s) may be added to the RAS line 20 in addition to or alternative to the first anoxic zone 14 , the second anoxic zone 22 , and combinations thereof.
- first bacteria for example, specific first bacteria, second bacteria, anoxic zones, nitrogen-containing composition(s), macronutrients, micronutrients, and organic acids falling within the claimed parameters, but not specifically identified or tried in a particular composition or method, are expected to be within the scope of this invention.
- the present invention may suitably comprise, consist or consist essentially of the elements disclosed and may be practiced in the absence of an element not disclosed.
- the method may consist of or consist essentially of adding an effective amount of at least one nitrogen-containing compound to a wastewater stream having a first bacteria and at least one organic acid within a water treatment system, at least partially reducing an amount of organic acid(s) within the wastewater stream, and reducing an amount of the first bacteria within the wastewater stream as compared to an otherwise identical wastewater stream absent the nitrogen-containing compound(s);
- the first bacteria may be or include, but is not limited to, filamentous bacteria, amorphous Zoogloea bacteria, fingered Zoogloea bacteria, and combinations thereof; and the second bacteria may out-compete the first bacteria in consuming the organic acids.
- the water treatment system having a wastewater stream flowing therethrough may consist of or consist essentially of an influent wastewater stream flowing into the wastewater treatment system, at least one anoxic zone, an aeration basin, and an effluent wastewater stream flowing out of the water treatment system having a reduced amount of the first bacteria as compared to an otherwise identical effluent wastewater stream absent the at least one nitrogen-containing compound(s);
- the influent wastewater stream may flow into the water treatment system having at least a first bacteria and at least one organic acid where the first bacteria may be or include filamentous bacteria, amorphous Zoogloea bacteria, fingered Zoogloea bacteria, and combinations thereof;
- the anoxic zone may have or include may have or include the wastewater stream, an effective amount of at least one nitrogen-containing compound, and a second bacteria;
- the second bacteria may be or include facultative bacteria, spore-forming bacteria, phenol degrading bacteria, denitrifying bacteria, organic acid-degrading bacteria, high temperature bacteria, and combinations thereof.
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- Biodiversity & Conservation Biology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
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Abstract
Description
Claims (18)
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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US14/268,554 US9399591B2 (en) | 2014-05-02 | 2014-05-02 | Nitrogen-containing compounds for bacterial control in water based fluids |
US14/336,858 US9751788B2 (en) | 2014-05-02 | 2014-07-21 | Bacterial additives for biological and/or chemical contaminants within water-based fluids |
PCT/US2015/025123 WO2015167771A1 (en) | 2014-05-02 | 2015-04-09 | Nitrogen-containing compounds for bacterial control in water based fluids |
CN201580023564.XA CN106255669A (en) | 2014-05-02 | 2015-04-09 | The nitrogen-containing compound of bacterial control in water-based fluid |
EP15785327.6A EP3137425A4 (en) | 2014-05-02 | 2015-04-09 | Nitrogen-containing compounds for bacterial control in water based fluids |
CA2946700A CA2946700A1 (en) | 2014-05-02 | 2015-04-09 | Nitrogen-containing compounds for bacterial control in water based fluids |
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US14/268,554 US9399591B2 (en) | 2014-05-02 | 2014-05-02 | Nitrogen-containing compounds for bacterial control in water based fluids |
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US14/336,858 Continuation-In-Part US9751788B2 (en) | 2014-05-02 | 2014-07-21 | Bacterial additives for biological and/or chemical contaminants within water-based fluids |
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US20150315049A1 US20150315049A1 (en) | 2015-11-05 |
US9399591B2 true US9399591B2 (en) | 2016-07-26 |
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US (1) | US9399591B2 (en) |
EP (1) | EP3137425A4 (en) |
CN (1) | CN106255669A (en) |
CA (1) | CA2946700A1 (en) |
WO (1) | WO2015167771A1 (en) |
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CN109880645B (en) * | 2019-04-12 | 2020-09-01 | 重庆路牛科技有限责任公司 | Coke upgrading synergist and preparation and use methods thereof |
CN113005062B (en) * | 2021-03-24 | 2022-05-13 | 中国科学院成都生物研究所 | Facultative ammonia oxidizing bacteria and application thereof |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3867284A (en) | 1972-06-02 | 1975-02-18 | Kappe Associates Inc | Water treatment with nitrogen dioxide |
USRE37181E1 (en) | 1988-12-09 | 2001-05-22 | U.S. Filter Corporation | Process for removal of dissolved hydrogen sulfide and reduction of sewage BOD in sewer or other waste systems |
US7416669B1 (en) * | 2006-02-24 | 2008-08-26 | Schreiber, Llc | Biological nutrient removal process and process control system for same |
US7799215B2 (en) | 2008-01-30 | 2010-09-21 | Siemens Water Technologies Corp. | Wastewater treatment systems |
Family Cites Families (7)
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SE9700302D0 (en) * | 1997-01-30 | 1997-01-30 | Scanvironment Ab | Method for more efficient biological nutrient reduction |
US6039875A (en) * | 1997-11-17 | 2000-03-21 | Interbio, Inc. | Composition and method for removing suspended solids from wastewater |
US7854842B2 (en) | 2001-03-02 | 2010-12-21 | Daniel Robert Miklos | Apparatus and methods for control of waste treatment processes |
DK2172430T3 (en) * | 2007-08-08 | 2011-10-17 | Guanghao Peng | Process for removing impurities of C, N using heterotrophic ammonia-oxidizing bacteria |
CN201136824Y (en) * | 2007-12-21 | 2008-10-22 | 北京工业大学 | Denitrification phosphorus removal device through anaerobic- anoxic oxidation channel process |
MX2012006387A (en) * | 2009-12-01 | 2012-10-03 | Dayong Li | Sludge treatment method and apparatus thereof and application to wastewater bio-treatment. |
CA2804047C (en) * | 2010-07-01 | 2018-07-31 | Alexander Fassbender | Wastewater treatment |
-
2014
- 2014-05-02 US US14/268,554 patent/US9399591B2/en active Active
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2015
- 2015-04-09 EP EP15785327.6A patent/EP3137425A4/en not_active Ceased
- 2015-04-09 CA CA2946700A patent/CA2946700A1/en not_active Abandoned
- 2015-04-09 WO PCT/US2015/025123 patent/WO2015167771A1/en active Application Filing
- 2015-04-09 CN CN201580023564.XA patent/CN106255669A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3867284A (en) | 1972-06-02 | 1975-02-18 | Kappe Associates Inc | Water treatment with nitrogen dioxide |
USRE37181E1 (en) | 1988-12-09 | 2001-05-22 | U.S. Filter Corporation | Process for removal of dissolved hydrogen sulfide and reduction of sewage BOD in sewer or other waste systems |
US7416669B1 (en) * | 2006-02-24 | 2008-08-26 | Schreiber, Llc | Biological nutrient removal process and process control system for same |
US7799215B2 (en) | 2008-01-30 | 2010-09-21 | Siemens Water Technologies Corp. | Wastewater treatment systems |
Also Published As
Publication number | Publication date |
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EP3137425A1 (en) | 2017-03-08 |
CN106255669A (en) | 2016-12-21 |
US20150315049A1 (en) | 2015-11-05 |
EP3137425A4 (en) | 2018-01-17 |
CA2946700A1 (en) | 2015-11-05 |
WO2015167771A1 (en) | 2015-11-05 |
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